M. E. Thompson
Princeton University
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Featured researches published by M. E. Thompson.
Physics of Plasmas | 1995
S.D. Scott; M. C. Zarnstorff; Cris W. Barnes; R. E. Bell; N. Bretz; C.E. Bush; Z. Chang; D. Ernst; R.J. Fonck; L. C. Johnson; E. Mazzucato; R. Nazikian; Stephen F. Paul; J. Schivell; E. J. Synakowski; H. Adler; M.G. Bell; Robert V. Budny; E. Fredrickson; B. Grek; A. Janos; D. Johnson; D. McCune; H. Park; A. T. Ramsey; M. H. Redi; G. Taylor; M. E. Thompson; R. Wieland
The confinement and heating of supershot plasmas are significantly enhanced with tritium beam injection relative to deuterium injection in the Tokamak Fusion Test Reactor [Plasma Phys. Controlled Fusion 26, 11 (1984)]. The global energy confinement and local thermal transport are analyzed for deuterium and tritium fueled plasmas to quantify their dependence on the average mass of the hydrogenic ions. Radial profiles of the deuterium and tritium densities are determined from the D–T fusion neutron emission profile. The inferred scalings with average isotopic mass are quite strong, with τE∝〈A〉0.85±0.20, τEthermal∝〈A〉0.89±0.20, χitot∝〈A〉−2.6±0.5, and De∝〈A〉−1.4±0.2 at fixed Pinj. For fixed local plasma parameters χitot∝〈A〉−1.8±0.4 is obtained. The quoted 2σ uncertainties include contributions from both diagnostic errors and shot irreproducibility, and are conservatively constructed to attribute the entire scatter in the regressed parameters to uncertainties in the exponent on plasma mass.
Nuclear Fusion | 1995
Z. Chang; E. D. Fredrickson; S.J. Zweben; H. Park; R. Nazikian; E. Mazzucato; S.H. Batha; M.G. Bell; Robert V. Budny; C.E. Bush; D.S. Darrow; D. Ernst; G. Y. Fu; R.J. Hawryluk; K. W. Hill; J. Hosea; A. Janos; D.L. Jassby; D. Johnson; L. C. Johnson; F. M. Levinton; D.K. Mansfield; K. McGuire; David Mikkelsen; D. Mueller; D.K. Owens; A. T. Ramsey; Steven Anthony Sabbagh; E. J. Synakowski; H. Takahashi
An Alfven frequency mode (AFM) is very often seen in TFTR neutral beam heated plasmas as well as in ohmic plasmas. This quasi-coherent mode has so far only been seen on magnetic fluctuation diagnostics (Mirnov coils). A close correlation between the plasma edge density and the mode activity (frequency and amplitude) has been observed, which indicates that the AFM is an edge localized mode with r/a>0.85. No direct impact of this mode on the plasma global performance or on fast ion loss (e.g., the alpha particles in DT experiments) has been observed. This mode is not the conventional TAE (toroidicity induced Alfven eigenmode). The present TAE theory cannot explain this observation. Other possible explanations are discussed
Physica Scripta | 1995
S.D. Scott; D. Ernst; M. Murakami; H. Adler; M.G. Bell; R. E. Bell; Robert V. Budny; C.E. Bush; Z Chang; H.H. Duong; L R Grisham; E. Fredrickson; B. Grek; R.J. Hawryluk; K. W. Hill; J. Hosea; D.L. Jassby; D. Johnson; L. C. Johnson; M. J. Loughlin; D.K. Mansfield; K. McGuire; D.M. Meade; D M Mikkelsen; J. A. Murphy; H. Park; A. T. Ramsey; J. Schivell; C.H. Skinner; J. D. Strachan
Both global and thermal energy confinement improve in high-temperature supershot plasmas in the Tokamak Fusion Test Reactor (TFTR) when deuterium beam heating is partially or wholly replaced by tritium beam heating. For the same heating power, the tritium-rich plasmas obtain up to 22% higher total energy, 30% higher thermal ion energy, and 20-25% higher central ion temperature. Kinetic analysis of the temperature and density profiles indicates a favorable isotopic scaling of ion heat transport and electron particle transport, with τEi(a/2) ∝ A0.7-0.8 and τpe(a) ∝ A0.8.
